Ana Del Valle and Basil Gray

It's about 6 p.m. on Friday, May 11th, 2018.

As Maria Del Valle is on her way home from working at the Brooklyn Hospital, she kicks off the Mother's Day weekend by stopping to buy some flowers for her mom.

Maria was extremely close to her mother, 62-year-old Ana Del Valle.

The Brooklyn apartment where Ana raised her children was now a multi-generational family home, shared by Ana, Maria, and her twin brother Luis.

The twins were now in their 40s, but by all accounts, Ana loved having them all together.

So, with flowers in hand, Maria made her way up to their family's apartment, 5C, just as she'd done countless times before in her life.

But when she got to their unit, she immediately realized that the door was unlocked.

This was odd to her because she, Luis, and their mother were meticulous about locking the door.

And when she opened it, she was met with a horrific image.

Her mother, Ana, was lying on the floor of their apartment, surrounded by blood.

During an interview with the Unsolved Mysteries podcast, Maria said that she initially thought her mom had fallen and hit her head, so she grabbed her mom to try to help, and that's when she realized that her arms were bound with an electrical cord.

Her interview is really nothing short of heartbreaking.

She describes her disbelief as she tried to resuscitate her mom, thinking to herself that surely everything's going to be okay.

But then, she turned her mom over, and that's when she saw it.

Ana had a gunshot wound on the side of her head and in the middle of her forehead.

She was also shot in the torso, but it's unclear if Maria saw that immediately.

In complete shock, she still manages to dial 911 for help.

She later told ABC7 New York, "...I can never erase it, that horrific image of my mom.

They tied her up, some coward with a gun.

I try to imagine what she went through lying there, the whole day lying there, and I had to come and find her that way.

It was so brutal." The NYPD was on the scene within minutes, and immediately removed Maria from the scene.